Band-saw.



E. SGHMELZLE.

BAND SAW.

APPLICATION FILED JULY 17, 1914.

1,125,738, Patented Jan.19, 1915.

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Jrromvar THE NORRIS PETERS 60.. PHDTU-LITHKL. WASHINGYBN D. c.

. adjustability ERNST SOI-IMELZLE, OF IVIITTEL'IAL, GER-MANY.

BAND-SAW.

Specification of Letters Patent.

Patented Jan. 19, 1915.

Application filed July 17, 1914. Serial No. 851,516.

To all whom it may concern Be it known that I, ERNST SCHMELZLE, a citizen of the German Empire, residing at Mitteltal, in the Kingdomof VVurttemberg, Germany, have invented certain new and useful Improvements in Band-Saws; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Band saws with a number of independently adjustable saw blades are already known, in which the saw blades can be so adjusted in relation to one another by adjusting the different saw frames or the roller guides for the saws, that a number of planks of equal or of different thickness can be out from one trunk or the like as the latter goes through the machine. In these known band saws, howevergthe changing of a saw blade is attended with considerable difficulty, for overcoming which it is necessary that the to one another should be limited, if it be desired thatthe changing of a saw blade shall not involve the necessity of shifting the different band saw frames. The latter however, naturally implies a complete interruption of the working and consequently a considerable loss of time.

The present invention consists in a bandsaw machine with a number of saw blades, which entirely obviates the above mentioned di 'iculties, because notwithstanding that the saw blades are adjustable within wide limits the arrangement adopted enables the different saw blades to be changed in the shortest possible time and without any troublesome preparatory work. For this purpose a single driving disk for all the saw blades, and a special tension roller for each single saw blade are arranged outside the band saw frame on which the saw rollers are seated, so that all that is necessary for changing a saw blade is that its tension roller should be released and the saw blade be exchanged. The upper and lower guide rollers of each single saw blade are suitably arranged on the machine frame. They are connected with one another and rotatively and adjustably arranged on the frame, so that for adjusting the saw blades in relation to one anon the machine frame 0.

driving pulley of the saw blades in relation other all that is required is a suitable turning of pairs of levers.

The invention is illustrated in the in one form by way of example.

Figure l is a transverse section of the novel band saw; Fig. 2 a front elevation of the same. Figs. 3 and 4 illustrate a guide for the saw blades on an enlarged scale.

The saw blades a of the band saw are guided in the usual manner over two wheels 6 whichare mounted on ball or roller bearings on bent levers d in the upper and lower parts of the machine frame 0. The free ends of the other arms of the bent levers (Z are connected with one another by means of a rod 6 or the like, which can be adjusted by means of a nut f. For adjusting the different bent levers d a lever g is employed which is arranged on a shaft it that is fixed drawlng According to the invention, the saw blades a are actuated by one and the same 2', which is arranged outside the machine frame 0. Beyond this a tension roller 7s for each single saw blade is arranged outside the frame a. This roller is seated on a bent lever Z, which is loaded with a weight m or the like and keeps the saw blade always under the right tension.

For guiding the saw blades a of each single band saw, bent metal guides at are arranged on the bent levers d. In front of each of these is an adiustable slot guide 0 for the saw blade. This slot guide 0 consists of a sleeve ya that pivots around the bent metal guide n. In this sleeve a piece of wood or the like is inserted in which the slot (7 for the passage of the saw blade is formed. l/Vhile the saw blades are being put on, the guide 0 can be turned back and be put in the proper position again when the saw blades have been fixed.

In other respects the machine may be constructed as may be preferred.

What I claim and desire to secure by Letters Patent is 1. In a band-saw machine, the combination of a frame; pairs of levers fulcrumed thereon; a wheel on each lever; a yieldable tension roller for each pair of levers; and a band-saw disposed about the outer part of each tension roller and the wheels of the corresponding pair of levers.

2. In a band-saw machine, the combination-of a frame; pairs of levers -fulcrumed thereon; awheel-on each lever; a yieldable tension roller for each pair of levers; and

5 a band-saw disposed about the outer part of each tension roller and the wheels of the corresponding pair of levers, and rollers being outside of the actual frame of the machine.

3. In a band-saw machine, the combination of a frame; a plurality of levers adjustably :t'ulcrumed thereon one above the other in pairs side-by-side; heels on said levers; a driving pulley; displaceable tension rollers, one for each pair oi. levers; and band-saws disposed around the outer part of said WhGGlS', rollers and pulley, said Wheels, rollers and pulley being outside of the actual frame of the machine.

I 4r. In a, band-saw machine, the combination of a' frame; a'pair thereon; a ivlieelon each lever; a rod having its opposite ends directly pivoted to said levers respectively;

posed about said Wheels. V

5. Ina band-saiv machine, the combina- 'tion of a frame; plurality o1"- levers adustably tul crunied I other in pairs'side-by-side; heels on said solev'ers; a driving pulley; displaceable tension rollers, one for each pair of levers;

and band-saws disposed around the outer part of said Wheels, rollers and pulley.

6. ln aband-saiv. machine, the combination of strains; a plurality of levers ful:

crumed' thereon one above the other in pairs arranged side-by-side; Wheels onsaid levers; rods'pivoted to the levers and linking and holding inpa allelisiri the levers of, said 40 pairs;a driving pulley; aplu'rality of yield ablyfsupp'orte'd"tension rollers, one for each "co ies dz this 'p'at en't maiy be obtained for said Wheels frame one above the other oflevers fulcrumed and band-saws disthereon one above the p justing each pair T1661. by the lev pair of levers; band-saws disposed over said Wheels, rollers and pulley; and means tor adjusting the levers.

7. In a band-saw machine, the combination of a frame; a plurality of levers fulcrumed, at their intermediate part, on said in at least three pairs movably disposed side-by-side; Wheels mounted near the ends of said levers at one side of the frame; a drive pulley at the other side oi the frame; yieldably supported tension rollers; band-saws disposed on said wheels, roller-sand pulley; and rods pivotally connected to said levers at the ends away from sale wheels and linking together the levers of each of said pa1rs.

'8. In a band-saw machine, the combination or a frame; a plurality of levers fulcrumed at their lntermetuat'e part on sa1d irame, one above the other 1n pairs movaoly dispose siue-by-side in parallel planes; wheels rotatably mounted on the' ends of said levers at one side of the frame; a drive pulley at tne othei side or the iiame; tens on rollers, one corresponding to each pair oi levers and the Wheels thereon, yieldably disposed above saiddrive pulley; a bandsaw disoosed about the drive ulle each 7 l. a

tension roller and the corresponding Wheels;

rods linking togethertlie levers of each pair at the ends not carrying the Wheels and dis- .iosec substantiallywithi "he space bounded by the band-saws; meanshr angnlarly adoi? levers and guides cars for guiding the saws. V

' In testimony whereof I ailix my" signature, in presence of two 'WltDQSSES.

- ERNST SCHMELZLE.

Witnesses: I

Gnone HA'NsoHMANN, V FRIDA KnAnsrJI-z.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

